Dark Passage (1947) [Madge Rapf]: Falls through a window while backing away from Humphrey Bogart, after he confronts her about his wife's murder. (Thanks to Mac)

How the West Was Won (1962) [Rebecca Prescott]: Drowned, along with Karl Malden, when their raft sinks; the scene cuts away as the raft is about to go over the falls, followed by a scene of their children at the funeral. (Thanks to Mable)

Night Gallery: Certain Shadows on the Wall (1970) [Emma Brigham]: Gradually poisoned over a prolonged time (beginning before the start of the episode) by her brother (Louis Hayward). Her body is shown lying in bed after she finally dies, and her shadow remains behind on the wall after her body is removed.